1806 motor troubleshooting

[The Hangar]

Ok quick motor question here. I’ve got an old 1806 “Rise” motor from hobbyking (I think) and I ran it up the other day under no load with no issues (now it’s stuttering a bit on startup though). I mounted it on a plane, put a prop on it, and it stutters past about 1/3 throttle. I tried calibrating several times to no avail. I took the motor apart and I found a break in the copper wire - could that be causing the issue? I can’t find anything else wrong with it. I’m just stumped that it works at lower throttle but not higher throttle when under load (propeller). I may try soldering it back if I can find a magnifying glass, but there’s not much room to work! It’s a cheap motor and I have another on the way, but I’d like to understand what’s going on!

 

[LitterBug]

You could measure the resistance of the three phases to see if one is way off from the others. Broken coils are bad for sure. It is hard to tell from the picture if that is an intentional internal bridge, if there is additional coil damage, or a break. It's also possible there is a bearing issue or a short where the damage happened.

 

[Bricks]

The winding wire used on these motors ( all motors ) has an insulating coating once that is gone burned what ever it is toast. Usually only repair is rewinding. This is the wire I use for lights on my planes being insulated and light.

 

[The Hangar]

You could measure the resistance of the three phases to see if one is way off from the others. Broken coils are bad for sure. It is hard to tell from the picture if that is an intentional internal bridge, if there is additional coil damage, or a break. It's also possible there is a bearing issue or a short where the damage happened.

Good idea, I'll give that a try.

The winding wire used on these motors ( all motors ) has an insulating coating once that is gone burned what ever it is toast. Usually only repair is rewinding. This is the wire I use for lights on my planes being insulated and light.

I like that idea of using the old wire for lights, I'm going to borrow that.

 

[Foamforce]

I had a motor that would beep just fine at startup, but it would stutter when I gave it power. That confused me because the esc beeps come from vibrating the motor. I assumed that the windings must be partially melted. I noticed though, that one of the bullet connectors seemed loose, so I replaced it and the problem went away. So there was just enough of a connection to vibrate the motor for the esc beeps, but not enough to carry real amps to run the motor.

Yours sure does look like a broken winding though!

 

[Timmy]

I had the same issue a few years ago. A break in the copper wire caused by using mounting screws that were too long. The motor would be ok at low throttles but stutter when throttling up.

 

[The Hangar]

I had the same issue a few years ago. A break in the copper wire caused by using mounting screws that were too long. The motor would be ok at low throttles but stutter when throttling up.

That sounds exactly like what my motor’s doing. I looked up some videos on re-winding brushless motors and it looks like a pain but I may try it. I’ve got a radial C pack motor that also needs rewound so it might be worth a shot.